工程投标是承包商在同意招标商拟定的招标文件所提出的条件的前提厂，估计商品价格，开列清单，向招标商提出报价的一种商品售卖行为。它是我国经济体制改革由社会主义计划经济到社会主义市场经济发展的产物；也是我国商品经济发展的结果；是施工企业实现经营战略和生存发展的 The project bid is a premise factory where the contractor agrees with the conditions proposed in the tender documents drafted by the tenderer, estimates the commodity prices, lists the items, and offers a bid for the commodities offered by the tenderer. It is the product of China’s economic system reform from the socialist planned economy to the development of the socialist market economy; it is also the result of the development of China’s commodity economy; it is the construction company’s business strategy and survival and development.